the.com/sliver

the smallest possible portion that still demands your full attention when it lodges under your skin

means A thin, narrow piece of something split or cut from a larger whole.

from From Middle English 'sliveren,' to split or cleave, related to 'slive' (to cut or slice). It belongs to a family of Germanic words about splitting and cleaving — a cousin, possibly, of 'slice' and 'split' — and has always carried that sense of something cleanly broken away. The soft 'sl-' beginning echoes a whole cluster of English words for things that slip, slide, and slide apart.

etymology
From Middle English meaning to cleave or split apart
glassmaking
Slivers of obsidian once made the sharpest blades known
pie law
A sliver eaten standing up contains zero calories, allegedly
splinter physics
Tiny wood slivers hurt more than large cuts
moon phase
A thin crescent is literally called a sliver moon
for instance

silver sliver coins — thin silver strips minted as currency, notably us dimes at 90% silver until 1964

splinter in finger — wood or metal sliver embedded in skin, commonly removed with tweezers in emergency rooms daily

sliver of moon — crescent moon phase visible as thin bright arc, occurs during waxing/waning crescents each lunar cycle

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